response.go

package main

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"
)

type errorResponse struct {
	Error string `json:"error,omitempty"`
}

func respondWithError(w http.ResponseWriter, code int, msg string) {
	er := errorResponse{}
	er.Error = msg

	dat, err := json.Marshal(er)
	if err != nil {
		logMsg := fmt.Sprintf("Error marshalling JSON: %s", err)
		log.Println(logMsg)
		w.WriteHeader(http.StatusInternalServerError)
		w.Write([]byte(logMsg))
		return
	}

	w.WriteHeader(code)
	w.Write(dat)
}

func respondWithJSON(w http.ResponseWriter, code int, payload any) {
	dat, err := json.Marshal(payload)
	if err != nil {
		logMsg := fmt.Sprintf("Error marshalling JSON: %s", err)
		log.Println(logMsg)
		respondWithError(w, http.StatusInternalServerError, logMsg)
		return
	}

	w.WriteHeader(code)
	w.Write(dat)
}